The Extech Instruments 407355 Noise Dosimeter/Datalogger Kit is low cost, lightweight, and easy to use for measuring total sound exposure for over an 8-hour period. Features 5 dosimeters and sound calibrator, the datalogger performs OSHA and IEC Noise accumulation surveys. Adjustable criterion level, exchange rate and threshold allow you to measure different types of noises. Applications include personal accumulated noise exposure measurement, workplace noise assessment, OSHA and other regulatory agency compliances. Datalogs up to 4500dB readings when used as a sound level meter. With careful use, this meter will provide years of reliable service.